Size distribution of Parkfield’s microearthquakes reflects changes in surface creep rate
Geophysical Journal International
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Abstract
The nucleation area of the series of M6 events in Parkfield has been shown to be characterized by low b-values throughout the seismic cycle. Since low b-values represent high differential stresses, the asperity structure seems to be always stably stressed and even unaffected by the latest main shock in 2004. However, because fault loading rates and applied shear stress vary with time, some degree of temporal variability of the b-value within stable blocks is to be expected. We discuss in this study adequate techniques and uncertainty treatment for a detailed analysis of the temporal evolution of b-values. We show that the derived signal for the Parkfield asperity correlates with changes in surface creep, suggesting a sensitive time resolution of the b-value stress meter, and confirming near-critical loading conditions within the Parkfield asperity.
Suggested Citation
Tormann, T., Wiemer, S., Metzger, S., Michael, A.J., Hardebeck, J.L., 2013, Size distribution of Parkfield’s microearthquakes reflects changes in surface creep rate: Geophysical Journal International, v. 193, no. 3, p. 1474-1478, https://doi.org/10.1093/gji/ggt093.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Size distribution of Parkfield’s microearthquakes reflects changes in surface creep rate |
| Series title | Geophysical Journal International |
| DOI | 10.1093/gji/ggt093 |
| Volume | 193 |
| Issue | 3 |
| Publication Date | March 28, 2013 |
| Year Published | 2013 |
| Language | English |
| Publisher | Royal Astronomical Society |
| Contributing office(s) | Earthquake Science Center |
| Description | 5 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Journal International |
| First page | 1474 |
| Last page | 1478 |